Heavy rocking base



FIG. 1 is a top, front isometric view of a heavy rocking base showing my new design;

FIG. 2 is a top plan view of the heavy rocking base;

FIG. 3 is a bottom plan view of the heavy rocking base; and,

FIG. 4 is a front elevational view of the heavy rocking base, the rear and side elevational views thereof being the same. 

Teh ornamental design for a heavy rocking base, as shown and described. 